Seamless-tube-forming mill.



UNITED STATES PATENT OFFICE.

LUDWIG WOLFFGRAM, OF BROOKLYNl NEW YORK.

SEAMLESS-TUBE-FORMING MILL.

Application filed July l, 1915.

To a/ZZ fic/fwny it' may concern Be it known that l, Lunwm 'OLFLGRAAT, a. citizen oit' the German lhnpire, and a res1- dent of New York, in the borough of Brooliyn, countyY of kings, and State of New York, have invented certain new and useful Improvements in Seainless-Tubc-Forming Mills, of which the following is a specilication.

This invention relates to rollers for seamless tube forming mills, and has for its ohject to provide rollers specially positioned and conligured to carry out a. new inode of operation to he hereinafter more fully dcscribed.

An embodin'ient of such rollers is shown in the accompanying drawings, and will .he more fully desoriiwd hereinafter and finally pointed out in thc claim.

ln the accompanying drawing. Figure l is a diagra Taxatie View oi one einmdinient ot this apparatus for rolling seamless tubes out ot' a solid mas-s. and Fig. L' is a side View thereof, the upper roller heilig ouiiited. Fig. i represents an elevation of one o' the side rollers, the upper roller, the plunger mani drei and the solid har o'l inctal in process et being tuhulated.

Similar reference ninnerals indicate correspouiline paris throughout the. figures ol the dri" g Tn tlie eznhofliznent of the inrenlion herein shown two rollers 10 and ll or iitl'erent sizes are disposed side by side apart from each other and a third roller l; is dispost-ul between them ahore the center thercol', The side rollers l0 andll have their axes in parallel vertical planes, the axis of the roller l0 lying in the Vertical plane 'new and the axis of the roller ll lying in the vertical plane kan. The axis of the ri l0 is downwardly inclined to the horizontal Vfrom left to right as seen in Fig. and the axis of the roller l1 is upwardly inclined to the horirontal from lef: to the right as shown in said ligure. The asis ot the smallest roller lies in the horizontal plane irnilicated by the line u--a and inclined to the Yertical planes aforesaid. said axis at one end lying in the vertical plane p and at the other end in the Vertical plane 7. The line 12`l3 of Fig. l indicates the aX'is of the roller ll and the "i le 1%15 indicates the. axis of the roller and the vertiml plane passing through 1e axis Y Specification of Letters Patent.

Patented May 30, 1916. Serial No. 37,609.

parallel with the vertical plane passing through the other.

he upper roller 16, shown in Fig. 1, runs along loosely, in the well.knownmanner, during the rolling process and is arranged in horizontal bearings and lies in a certain angular position to the two vertical planes j ust referred to. By the entrance of the mass or block 17 of solid material out of which the seamless tube is' to be formed between the rollers 16, 11 and 10, the block is so constricted that during the rotation of the rollers and the block, a truncated cone is formed. As a result of this, the formation of thin seamless tubes is possible. This is l'orinod in connection with the plunger man` drel by the rotating roller surfaces of the three rollers. This cone, looked at in the imagination, passes through a line of the conical surface of the roller 11 nearest a similar line of the conical surface of the roller l0, and through that line of the c0nical ,surface of the upper roller nearest these ti two, these lines .constituting line-S which form thel tangents of the imaginary cone and the rollers l0, 1l and 16. Such a line. ot' the roller 1l is seen in full view in Fig. 2, and is indicated hy 20-21, and when this roller is rotated it forms the tangential line referred to. Such a. line of the roller 10 is soon in full View in Fig. 2, as indicated hy Ql--`5, and when this roller is rotated, it foi-nis the tangential line referred to. This imaginary truncated cone has itslmse and upper surface in parallel planes, 21nd, of course. this hase and upper surface 4are of di florent sizes. The planes, passing through the hase and the upper surface, are perpendicular to the vertical planes, passing through the axes of the rollers. In other words, thel axis of the cone is horizontal. The plane, 'passing through the upper sur` face ot the cone which is perpendicular to this axis ot' the cone, cuts the edges22 and 27 of theI rollers ll and 10. and the pr0jection of the cutting points 21a and 25a is shown at point 30 in Fig. 2. This plane cuts also the edge Q9 at 29a. By this the up` per surface ot' the truncated cone is given a definite position, and thereby the position of the edges 27 and 22 and29 of the rollers 10, l1 and 1G are determined in relation to each other. The `other plane, which passes through the edge Q3 of the roller 11. the edge 26 of the roller 10, and the edge 28 of the 'lill aL LUN. and ents lie raler roller lll` and furnis the lian* lllrl; sono, curs the, edge .l' at L c us points 2l, 25 and 'aw lines l'orulingg pai of r1 trunraleal cone. which spend lo lines in llie roller HL and roller lll. v poi ing lines are al the saine time the lander lines. l have ronsidored an imaginary f or truneated cone7 with the bue-e la the truncated portiony and with ward or" the truncalied upper e lace n practice, he rollers llg l0 and lo are so au ranged that the mass or lank l0() from which the seamless tube is to be formed, takes a position corresponding lo this ius aginary truncated Cone, wieli the upper sur face of the truncated cone, that is, Lhe smaller diainetered portion7 contacting with the rounded head 5l of the mandrel 5l). As then the inaSs or block, from which the seamless tube is to be foi-:umh is moved 'l'orwarfllgVY by rhe rotating rollers. it is always taugential to the three rollers ll., l() and lo at ibree tangential lines. namely, QTL-Ell@ 25M-24:, and ZWLUS". ly illus leuning the mass or block of material with the smaller ainetered portion olf the eonically ,shaped mass, continually abutting agains the inandrel, very el'lieienl. and (hin rolled lobes are capable ol" being produced.

Fig. l illustrates the developineul, of a tube 10U out ol a blank 101) by lie aid, el lilie mandrel 5l) in conneeiion with the roll The truncated cone surf ol lhe roller 1l between /rfez' cooperates with the eorrespondingl largey iruneaed rfi/ne of elle side roller l0 and with he trunealed cone of the upper roller l@ nil'iieli liefs l'ieiween and c and with' lic head 5l of he mandrel The remaining cylindrical part a of the upper roller 16 between the parts (ff-(5, serve# to smooth the tube so formed. The ellieienej-f of this process depei'ids i 'ion the rela'iive angular positions deseri "l, by means cw which the truncated cone is capable olle formed, It has been found that if lh angular positions are, changed, so that 'En' truncated cone not Jorn'ied` in themanner described, the mass, when il: is rolled and rotated, is pressed too thin. and in eonsequenee, a cutting action of the inass This disadvantage-ous i feelin-caf wii' prevented liereofore the rolling g tubes of thin walls is oni v With by my iinprorerl pension rollers in themanner des be( imaginary 4roi-.e and i l Shaped to Conform if The line 20 of rmi" l? @e and the rollcr l' edf"- ol' lie uriner rui minar).Y

al he lin A- in the lne planes s nk if, axes oi the are arranged and the )ullilfilfuwi li; general min one "rfi 'lie sain lla? o ons of ille G each al. lie fore ull-:ir final lire ine conneczii B2i the fliree farmed out o Maller dei i Y ie rollersfwhero or smaller transiiorting; veloeiiy the mandrel i the upper f lrune l @one n 'ead of ih@ he ill lraentlv d side rollers position (L mined, it is posice very thi seainlesetuhes of brass, ere., herelollore inapossible ie means heretofore known.

l have shown one enihodinmit of my in weniion, but ir is l that: changes may he 'l gr ting i ,n the red ux tin l, iat I cid @ni-5011, I have e i a subscrzbl? LL D WP? EM M.

e foregoing as .ai my name 1n imess. 

